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All Journal Rotasi Indonesian Journal Of Business And Economics Jurnal Riset Biologi dan Aplikasinya
Harto, Harto
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Economics, Econometrics & Finance Environmental Science Immunology & microbiology Mechanical Engineering Medicine & Pharmacology

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OPTIMIZATION OF CAT 374D L ARM EXCAVATOR STRUCTURE TOPOLOGY DESIGN USING FINITE ELEMENT METHODS Suryo, Sumar Hadi; Harto, Harto; Yunianto, Bambang
ROTASI Vol 22, No 2 (2020): VOLUME 22, NOMOR 2, APRIL 2020
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.22.2.79-86

Abstract

In the current era of development, infrastructure is the driving wheel of economic growth. Company manufacturer of construction which is headquartered in Illinois, United States of America, namely Caterpillar Inc. is a large manufacturer of construction equipment that operates more than 157 countries. Excavators are heavy equipment and are usually used for excavation. During the operation of extracting the unknown forces resistive offered by the terrain to the bucket teeth. In this study discusses the design optimization of the arm of the excavator to produce a design that is lightweight but still retains his strength, arm of the excavator is R4.67m CAT 374D L. Process optimization on the arm of the excavator to apply the concept of optimization the topology. The method includes the determination of the type of material Hardox400. The analysis was then performed linear static using the finite element method to see the maximum voltage that occurs on the arm of the excavator, the value of the stress von Mises amounted to 350.9 MPa. Further optimization of the topology by selecting some of the variations in area design which produces a reduction of mass of 4000 kg became 3852 kg. The reduction of mass causes a change in voltage that occurs on the arm of the excavator to be 340.9 MPa and a safety factor of design optimization to achieve 2.88 is still in a safe condition.
The Biology of Invasive Native Plant as an Ex-situ Collection: A Case Study of Epipremnum pinnatum (L.) Engl. (Araceae) in Bogor Botanical Garden, Indonesia zulkarnaen, rizmoon; Martiansyah, Irfan; Damayanti, Frisca; Wardani, Fitri Fatma; Yudaputra, Angga; Robiansyah, Iyan; Hutabarat, Prima Wahyu K.; Harto, Harto
Jurnal Riset Biologi dan Aplikasinya Vol. 6 No. 2 (2024)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jrba.v6n2.p60-72

Abstract

The Bogor Botanical Garden (BBG) is a pivotal center for plant research and conservation, boasting a diverse collection of over 12,000 individual plants spanning various species. However, among the plant collections at BBG, some of them have the potential to be invasive. Therefore, this study aimed to uncover the plant collections at BBG with invasive potential and analyze the distribution of one of the most dominant collections, Epipremnum pinnatum (L.) Engl. The method employed in this research involved a literature review to identify which plant collections have invasive potential and a vegetation analysis on the distribution of E. pinnatum within BBG. Additionally, ANOVA analysis and regression models were employed to explore the relationship between environmental factors and E. pinnatum abundance. Results revealed that BBG hosted 78 potentially invasive plant species, with E. pinnatum comprising 28 individuals. Spatial analysis indicates a clustered distribution of E. pinnatum, influenced by seed dispersal mechanisms, environmental factors, and biotic interactions. Correlation analysis links soil pH, soil moisture, and canopy cover to E. pinnatum distribution. Canopy cover demonstrates a significant positive correlation with E. pinnatum abundance, suggesting its importance in providing favorable microclimates for growth. Regression analysis further supports canopy cover as a predictor of E. pinnatum presence. However, while a strong statistical association was observed, causal relationships require further investigation. This study underscores the complexity of ecological dynamics in BBG and emphasizes the need for comprehensive research to define underlying mechanisms driving plant distributions and interactions.
THE EFFECTIVENESS OF VIRAL MARKETING ON PURCHASE DECISIONS THROUGH CUSTOMER TRUST ON THE TOKOPEDIA PLATFORM Hendrawan, Diky Angga; Nabilah, Anisah; Hamiduddin, Ahmad Yahya; Harto, Harto
Indonesian Journal Of Business And Economics Vol 7 No 2 (2024)
Publisher : Universitas Kuningan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25134/ijbe.v7i2.11009

Abstract

Viral Marketing is a type of marketing that is low-cost because it relies on social media to spread information. The phenomenon of online shopping is increasingly becoming the choice of many people, because shopping online can save time without having to go to a physical location to shop. There are several factors that consumers need to consider before making a purchasing decision, such as trust, where in making online transactions it is important to have certainty, ease in finding the desired product, and clear information about the product and how to buy. This study was conducted using descriptive and verification methods, which then produced conclusions and suggestions. Samples were collected using the Incidental Sampling method, with a total of 205 respondents. Based on the analysis that has been done, this study proves that Viral Marketing has a significant influence on Customer Trust. Furthermore, Customer Trust also has a significant influence on Purchasing Decisions. In addition, Viral Marketing has a significant influence on Purchasing Decisions.
Co-Authors Bambang Yunianto Damayanti, Frisca Fitri Fatma Wardani Hamiduddin, Ahmad Yahya Hendrawan, Diky Angga Hutabarat, Prima Wahyu K. Iyan Robiansyah MARTIANSYAH, Irfan Nabilah, Anisah Sumar Hadi Suryo Yudaputra, Angga zulkarnaen, rizmoon